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P89V51RB2BBC Datasheet(PDF) 8 Page - NXP Semiconductors

Part # P89V51RB2BBC
Description  8-bit 80C51 5 V low power 16/32/64 kB flash microcontroller with 1 kB RAM
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

P89V51RB2BBC Datasheet(HTML) 8 Page - NXP Semiconductors

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P89V51RB2_RC2_RD2_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 November 2009
8 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
P2.5/A13
26
23
29
I/O
P2.5 — Port 2 bit 5.
O
A13 — Address bit 13.
P2.6/A14
27
24
30
I/O
P2.6 — Port 2 bit 6.
O
A14 — Address bit 14.
P2.7/A15
28
25
31
I/O
P2.7 — Port 2 bit 7.
O
A15 — Address bit 15.
P3.0 to P3.7
I/O with
internal
pull-up
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 3 pins are pulled HIGH by the internal
pull-ups when ‘1’s are written to them and can be used as
inputs in this state. As inputs, Port 3 pins that are
externally pulled LOW will source current (IIL) because of
the internal pull-ups. Port 3 also receives some control
signals and a partial of high-order address bits during the
external host mode programming and verification.
P3.0/RXD
10
5
11
I
P3.0 — Port 3 bit 0.
I
RXD — Serial input port.
P3.1/TXD
11
7
13
O
P3.1 — Port 3 bit 1.
O
TXD — Serial output port.
P3.2/INT0
12
8
14
I
P3.2 — Port 3 bit 2.
I
INT0 — External interrupt 0 input.
P3.3/INT1
13
9
15
I
P3.3 — Port 3 bit 3.
I
INT1 — External interrupt 1 input.
P3.4/T0
14
10
16
I/O
P3.4 — Port 3 bit 4.
I
T0 — External count input to Timer/counter 0.
P3.5/T1
15
11
17
I/O
P3.5 — Port 3 bit 5.
I
T1 — External count input to Timer/counter 1.
P3.6/WR
16
12
18
O
P3.6 — Port 3 bit 6.
O
WR — External data memory write strobe.
P3.7/RD
17
13
19
O
P3.7 — Port 3 bit 7.
O
RD — External data memory read strobe.
PSEN
29
26
32
I/O
Program Store Enable: PSEN is the read strobe for
external program memory. When the device is executing
from internal program memory, PSEN is inactive (HIGH).
When the device is executing code from external program
memory, PSEN is activated twice each machine cycle,
except that two PSEN activations are skipped during each
access to external data memory. A forced HIGH-to-LOW
input transition on the PSEN pin while the RST input is
continually held HIGH for more than 10 machine cycles will
cause the device to enter external host mode
programming.
Table 3.
P89V51RB2/RC2/RD2 pin description …continued
Symbol
Pin
Type
Description
DIP40
TQFP44
PLCC44


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